<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="http://bilibili.com" >
    用户名：<input type="text" name="username" readonly maxlength="5" value="cxk" placeholder="请输入用户名">
    <br>
    密码：<input type="password" name="password" placeholder="请输入密码"><br>
    性别：<input type="radio" name="gender" value="man" id="r1">
    <label for="r1">男</label>
    <input type="radio" name="gender" value="women" id="r2">
    <label for="r2">女</label><br>
    爱好：<input type="checkbox" name="hobby" checked value="sing">唱
    <input type="checkbox" name="hobby" value="dance">跳
    <input type="checkbox" name="hobby" value="rap">Rap
    <input type="checkbox" name="hobby" value="ball">篮球<br>
    生日：<input type="date" name="birthday"><br>
    头像：<input type="file" name="pic"><br>
    所在地：<select name="city">
    <option selected>武汉</option>
    <option>南京</option>
    <option >成都</option>
    </select><br>
    <!--提交按钮-->
    <input type="submit" value="注册">
    <!--重置按钮-->
    <input type="reset">
    <!--自定义按钮-->
    <input type="button" value="自定义按钮">
    <hr>
    <button type="submit">注册</button>
    <button type="reset">重置</button>
    <button type="button">自定义按钮</button>

    <br>
    <input type="submit" value="注册" style="color: aqua">
</form>
</body>
</html>